AMD Athlon(tm) 5350 APU encoding video with ffmpeg using all four cores will after about one hour give a

CPU-temperature of +42.0°C with the fan running at 3835 RPM when using the stock cooler and a

CPU-temperature of +40.1°C with the passive Arctic Alphine M1.

You room temperature may vary.

It is impressive to note that this particular test was done with NO CASE FANS except the in the PSU in the Arctic cooler box and 2 fans in the box with the stock cooler.

The cooler won't lower your CPU temperature more than the stock cooler will do but it is impressive that it performs more of less just like it without any fan. The Arctic Alphine M1 is clearly a good buy, specially considering that I paid like $12 or something for two of these.